Tracing messages through a CAS server

I am configuring inbound internet message for my exchange 2013 system. and was planning on routing traffic from my DMZ edge servers to my internal CAS servers. I just realized that I will not be able to search messagetracking logs on the CAS servers should
we have delivery issues and need to trouble shoot transport.
- is there a way to trace messages through a CAS server? ( no mailbox role )
Would a preferrable configuration be to
- add the Mailbox Role to the CAS servers to enable messagetracking ( no user mailboxes )
- or to stand up a couple dedicated mailbox servers ( again, no user mailboxes ) to act as HUB servers for routing traffic
We are a large organization, think 20,000+ mailboxes, and there fore a LOT of traffic.
Tom

You can't see the normal message tracking logs on a CAS since it just proxies all the traffic but you can still enable protocol logging on the receive connector on the CAS to see more details when you need to.  The logs will be in the following location
(default)
%ExchangeInstallPath%TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpReceive
There is no need to add the MBX role to the CAS servers if you don't want to. 
http://technet.microsoft.com/en-us/library/bb124531(v=exchg.150).aspx
DJ Grijalva | MCITP: EMA 2007/2010 SPA 2010 | www.persistentcerebro.com

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